Sis forStatic (electricity)
Static electricity is a build up of electrical charge on the surface of something. This charge usually builds up when things rub together. You can make a static charge on a balloon by rubbing it on your clothes, and the child in the picture has got a static charge from sliding down a playground slide.
Static electricity discharges when something with the charge touches something else that can accept the charge. It discharges with a zap that can hurt.